We have a case open with our carrier regarding failure of SMS 'One time passcodes' from the credit card company Capital on Tap (CapOnTap). This has been escalated to the SMS aggregator as our carrier is not receiving the SMSs.
Whilst our carrier have raised it with the SMS aggregator, we'd also suggest that our customers affected by this also raise it with Capital on Tap so that this is taken more seriously.
Our SMS carrier have received confirmation from the aggregator that carries the CapOnTap SMS traffic that this issue has been resolved.